The apartment is in a condominium, a typical Bangkok sky scrapper.
It's a small but not too small apartment, which is comfortable and pleasant. Though it's a one room divided into two by a screen door, both "rooms" are large enough and feel separated.
There's an effective air-conditioner in both rooms and a washing machine. The place is quiet and you don't hear the outside (though in my last few days there I did repeatedly hear some noisy neighbors from next door).
The area - Sukhumvit 11 - is a very tourist-oriented area, filled with restaurants and bars that are mainly aimed at tourists. There are a few tourist traps/overpriced places but also a few decent ones (like a couple of authentic Thai food restaurants within walking distance). The Nana train station is about 800 meters - not too far (about 10 minutes walk) but also not super close. It gets you to Bangkok's center (Siam) in 3 stops.
Mike is an attentive host that replies very quickly and tries to help to solve problems. However, a relatively major one wasn't solved: The water in the shower doesn't get very warm, even at the maximum level. Though the building's staff quickly came to check it out - nothing changed.
Also were lacking a Coffee table in the living room (a must if you want to sit there with a drink or a snack. I solved it by moving there a bedside table from the bedroom) and some Sofa cushions that could have made sitting there a bit more comfortable. The bed's mattress is mediocre, not super comfortable. Also, a bigger variety of blankets with different levels of warmth would have helped (there was only a thick one, usually too warm for Bangkok weather).
But most of those are easy to solve and I assume Mike will do so. All in all, it's a good deal and a good pick - definitely after the problems I mentioned will be solved.